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A shrimp-farming business in the U.K. says it has created an economical and ecological alternative to traditional methods by using bacteria with a dual purpose -- to clean the water and provide food for the shrimp. Biochemical students from University College London founded the startup, called Marizca, which uses portable indoor units running on solar power to raise the shrimp. "The bacteria eat the shrimp waste and, at the same time, the shrimp eat the bacteria when they have reached a certain size. It makes producing shrimp a lot cheaper," said co-founder Leonardo Rios.

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To build support for possible executive actions, President Barack Obama met with construction executives and others to discuss specific immigration measures. Specific action could involve allowing spouses of specific visas to also work and making changes to the dual-purpose visa process. In addition, thought is being given to allow low-skilled workers that have temporary work authorization to be given work permits.

CIA graduate Barton Seaver is an advocate for the oceans. His mission is to promote portion control and healthy eating habits that will in turn support the ocean's delicate ecosystem. "The guiding hand of natural selection is holding a fork," Seaver says. "We have eco-friendly shrimp. But we can never have an eco-friendly all-you-can-eat shrimp buffet. It doesn’t work."

Scientists have discovered several species of fungi that reproduce by infecting passing ants and essentially turning them into zombies. The fungi take over an ant's brain and steer it up a plant stalk, where the possessed insect clamps onto a leaf with its jaws, then dies. The fungus then uses the ant's carcass as a dual-purpose snack bar and launch platform, feeding off the ant's remains while raining spores down on the surrounding area to infect more ants.

USA TODAY columnist Gladys Edmunds says she is in favor of casual clothing but even lawn guys and waitresses should come across as professional. She suggests that small companies at least supply T-shirts or aprons bearing the company logo, which serve a dual purpose -- employees look more professional and they are walking billboards.

A simple technique for cooking fish involves cubing it, adding it to melted butter and cooking it over low heat. A variation uses olive oil instead of butter, and scallops and shrimp in place of the shrimp.